Image display apparatus and image display method

Abstract

A sub-field lighting image display apparatus according to the present invention improves a dynamic false contour, motion judder, and the like occurring when displaying an image to which frame rate conversion is applied. A frame rate conversion section converts a frame rate for an input image. A motion vector detection section detects motion vector V0 between frames in the input image and finds motion vector V after the frame rate conversion based on the detected motion vector V0. When the frame rate conversion section repeatedly outputs the input image as an interpolation image, a motion vector correction section corrects the motion vector V to V1 using V1=V×α, where 0≦α<1. A sub-field conversion section converts each frame into luminescent data for multiple sub-fields. A sub-field correction section relocates the luminescent data for the sub-fields using the corrected motion vector V1.

Description

CLAIM OF PRIORITY[0001]The present application claims priority from Japanese patent application serial No. JP 2008-247968, filed on Sep. 26, 2008, the content of which is hereby incorporated by reference into this application.BACKGROUND OF THE INVENTION[0002](1) Field of the Invention[0003]The present invention relates to a sub-field lighting image display apparatus and an image display method for gradation display by time-sharing each of image frames created by frame rate conversion into multiple sub-fields.[0004](2) Description of the Related Art[0005]Frame rate conversion (frame count conversion) is needed when the frame rate of an input image signal differs from the display frame rate of an image display apparatus. The frame rate conversion preferably interpolates frames so that the image quality is prevented from degrading and an image continues to move smoothly between frames. A motion correcting frame count conversion method generates an interpolation frame signal by moving i...

AI Technical Summary

Benefits of technology

[0011]The frame rate conversion technology described in Japanese Published Unexamined Patent Application No. Hei 11-112939 reduces the motion judder and generates less blurred moving images. However, let us consider that a sub-field lighting display apparatus (PDP) displays an image in the frame rate conversion ON state as is without sub-field correction. The image causes a dynamic false contour that was invisible due to the moving image blur.

[0012]The sub-field correction technology described in Japanese Published Unexamined Patent Application No. Hei 8-211848 reduces the dynamic false contour from images when the frame rate conversion is turned on. However, the inventors found that the motion judder is emphasized when the frame rate conversion is turned off and that an image oscillates when the frame rate conversion is turned on from the off state, or vice versa.

[0013]The present invention has been made in consideration of the foregoing. It is therefore an object of the present invention to improve a dynamic false contour, motion judder, image oscillation, or moving image blur occurring when a sub-field lighting image display apparatus displays an image to which frame rate conversion is applied.

[0018]According to the invention, a sub-field lighting image display apparatus is capable of displaying a frame-rate converted image by reducing a dynamic false contour, motion judder, image oscillation, or moving image blur and providing a high-quality image that reduces image degradation.

Problems solved by technology

However, the following problem was found when the frame rate conversion ON / OFF state is simply combined with the sub-field correction on the display apparatus.

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